Probing spin-orbit quenching in Cl (2P) + H2 via crossed molecular beam scattering
| Autor: | K. E. Strecker, David Chandler, B. F. Parsons |
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| Rok vydání: | 2006 |
| Předmět: | |
| Zdroj: | The European Physical Journal D. 38:15-20 |
| ISSN: | 1434-6079 1434-6060 |
| DOI: | 10.1140/epjd/e2006-00018-2 |
| Popis: | In our previous work we investigated electronically non-adiabatic effects in $\rm Cl~(^{2}P_{3/2,1/2})+D_{2}$ using crossed molecular beam scattering coupled with velocity mapped ion imaging. The prior experiments placed limits on the cross-section for electronically non-adiabatic spin-orbit excitation $\rm Cl~(^{2}P_{3/2})+D_{2} \to Cl^*~(^{2}P_{1/2})+D_{2}$ and electronically non-adiabatic spin-orbit quenching $\rm Cl^*~(^{2}P_{1/2})+D_{2}\to Cl~(^{2}P_{3/2})+D_{2}$ . In the present work, we investigate electronically non-adiabatic spin-orbit quenching for $\rm Cl^*~(^{2}P_{1/2})+H_{2}$ which is the required first step for the reaction of Cl* to produce ground state HCl+H products. In these experiments we collide Cl (2P) with H2 at a series of fixed collision energies using a crossed molecular beam machine with velocity mapped ion imaging detection. Through an analysis of our ion images, we determine the fraction of electronically adiabatic scattering in Cl* +H2, which allows us to place limits on the cross-section for electronically non-adiabatic scattering or quenching. We determine the following quenching cross-sections σ quench(2.1 kcal/mol) = 26 ± 21 A2, σ quench(4.0 kcal/mol) = 21 ± 49 A2, and σ quench(5.6 kcal/mol) = 14 ± 41 A2. |
| Databáze: | OpenAIRE |
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